Automatic mean blood pressure reading device
First Claim
1. Apparatus for producing information indicative of the mean blood pressure of a living subject through indirect measurement comprising:
- (a) inflatable, deflatable cuff means;
(b) pump means, connected to said cuff means, for inflating said cuff to a pressure above systolic pressure of said subject;
(c) deflating means, connected to said cuff means, for controlled deflation of said cuff means;
(d) means for measuring cuff pressure and, at a given cuff pressure, pressure pulsations in said cuff means caused by heartbeats of said subject;
(e) control means, responsive to said means for measuring, for initially energizing said pump means to inflate said cuff, and for subsequently energizing said deflating means incrementally to deflate said cuff at predetermined pressure increments;
(f) wherein said measuring means includes;
(i) means for detecting, for each successive set of said pulsations occasioned by successive heartbeats, pulsation amplitude and pulsation time rate of change,(ii) means for identifying, at each of said cuff pressure increments, the occurrence of at least two successive sets of pulsations which meet predetermined amplitude and time rate of change criteria relative to one another,(iii) means, responsive to said means for identifying, for energizing said control means to deflate said cuff by an increment upon identification of said occurrence of pulsations within said criteria, and(iv) means, responsive to said means for identifying, for comparing specified peak to peak amplitude factors of identified pulsations at successive cuff pressure increments; and
(g) output means, responsive to said means for comparing, for indicating mean blood pressure as the lowest cuff pressure increment corresponding to the largest of said specified peak-to-peak amplitude factors.
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Accused Products
Abstract
An apparatus for producing information indicative of the mean blood pressure of a living creature through indirect measurement comprising an inflatable cuff, a pump connected to the cuff, a deflating valve connected to the cuff, measuring apparatus connected to the cuff adapted to measure cuff pressure and pressure oscillations occurring in the cuff caused by the heartbeat of the living creature and control apparatus connected to the pressure measuring apparatus, pump and deflating valve. Deflation of the cuff occurs in pressure increments, with processing being done at each given decrement to evaluate plural successive pulsations for purposes of artifact rejection and identification of a true pulsation.
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Citations
11 Claims
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1. Apparatus for producing information indicative of the mean blood pressure of a living subject through indirect measurement comprising:
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(a) inflatable, deflatable cuff means; (b) pump means, connected to said cuff means, for inflating said cuff to a pressure above systolic pressure of said subject; (c) deflating means, connected to said cuff means, for controlled deflation of said cuff means; (d) means for measuring cuff pressure and, at a given cuff pressure, pressure pulsations in said cuff means caused by heartbeats of said subject; (e) control means, responsive to said means for measuring, for initially energizing said pump means to inflate said cuff, and for subsequently energizing said deflating means incrementally to deflate said cuff at predetermined pressure increments; (f) wherein said measuring means includes; (i) means for detecting, for each successive set of said pulsations occasioned by successive heartbeats, pulsation amplitude and pulsation time rate of change, (ii) means for identifying, at each of said cuff pressure increments, the occurrence of at least two successive sets of pulsations which meet predetermined amplitude and time rate of change criteria relative to one another, (iii) means, responsive to said means for identifying, for energizing said control means to deflate said cuff by an increment upon identification of said occurrence of pulsations within said criteria, and (iv) means, responsive to said means for identifying, for comparing specified peak to peak amplitude factors of identified pulsations at successive cuff pressure increments; and (g) output means, responsive to said means for comparing, for indicating mean blood pressure as the lowest cuff pressure increment corresponding to the largest of said specified peak-to-peak amplitude factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for producing information indicative of the mean blood pressure of a living subject through indirect measurement comprising:
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(a) inflatable, deflatable cuff means; (b) pump means, connected to said cuff means, for inflating said cuff to a pressure above systolic pressure of said subject; (c) deflating means, connected to said cuff means, for controlled deflation of said cuff means; (d) means for measuring cuff pressure and, at a given cuff pressure, pressure pulsations in said cuff means caused by heartbeats of said subject; (e) control means, responsive to said means for measuring, for initially energizing said pump means to inflate said cuff, and for subsequently energizing said deflating means incrementally to deflate said cuff at predetermined pressure increments; (f) wherein said measuring means includes; (i) means for detecting, for each successive set of said pulsations occasioned by successive heartbeats, pulsation amplitude, (ii) means for identifying, at each of said cuff pressure increments, the occurrence of at least two successive sets of pulsations which meet predetermined amplitude criteria relative to one another, (iii) means, responsive to said means for identifying, for energizing said control means to deflate said cuff by an increment upon identification of said occurrence of pulsations within said criteria, and (iv) means, responsive to said means for identifying, for comparing specified peak-to-peak amplitude factors of identified pulsations at successive cuff pressure increments; and (g) output means, responsive to said means for comparing, for indicating mean blood pressure as the lowest cuff pressure increment corresponding to the largest of said specified peak-to-peak amplitude factors.
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Specification